Report from the Oak ICRA checklist
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Full Name: - Quercus ×heterophylla 'Sonchifolia'

Quercus ×heterophylla 'Sonchifolia' J. Booth ex Kirchn. in E. Petzold & G. Kirchner, Arb. Muscav., 658 (1864) as "Q. sonchifolia Booth" Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, section Lobatae (the red oaks)
Parentage
Q. phellos L. × Q. rubra L.